I think it depends. Does the doc try and release fluid built up in the prostate (milking) or is the purpose of the massage to oxygenate the area and aid blood flow (massage)?

Each of the massagers work a little differently for each individual. The Helix is a little more vigorous than the MGX, while the Eupho is more subtle. The Progasm is big but not big enough to stretch you and it will give a massage to the entire area.